(Solved): 3. The mass spectrum of butyl methacrylate (molecular formula \( \mathrm{C}_{8} \mathrm{H}_{15} \m ...

3. The mass spectrum of butyl methacrylate (molecular formula \( \mathrm{C}_{8} \mathrm{H}_{15} \mathrm{O}_{2} \) ) was obtained by both EI and Chemical ionization (CI) techniques. Which spectrum between \( \mathrm{A} \) and \( \mathrm{B} \) is most likely obtained by EI? Explain your reasoning. (1.5 pts)